(n.) An inverted pendulum consisting of a short vertical flat spring which supports a rod having a bob at the top; -- used for detecting and measuring slight horizontal vibrations of a body to which it is attached.

(n.) An old game at cards.

(n.) Any tern of the genus Anous, as A. stolidus.

(n.) The arctic fulmar (Fulmarus glacialis). Sometimes also applied to other sea birds.